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3 years ago

Please help I'm on a test rn

Chemistry

2 answers:

natka813 [3]3 years ago

7 0

Fridge so ur food doesn’t go off

belka [17]3 years ago

7 0

A microwave so that the heat waves can correctly cook your food if the microwave goes off you can’t

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Can alluminium sulphate or carbonate test the purity of water

Dominik [7]

Explanation:

When added to water, aluminum sulfate causes microscopic impurities to clump together into larger and larger particles. These clumps then settle to the bottom of the container and can be filtered out. This makes the water safer to drink

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3 years ago

How many grams of oxygen gas are contained in a 15 L sample at 1.02 atm and 28oC?

andreev551 [17]

Answer: You have 19.808 grams of Oxygen gas.

See picture for explanation.

8 0

3 years ago

Which electrons are the valence electrons of the atom?

Veronika [31]

Valence electrons are the electrons in the outermost shell, or energy level, of an atom. For example, oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell. We can write the configuration of oxygen's valence electrons as 2s²2p⁴

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3 years ago

What is the temperature of 0.750 mol of a gas stored in a 6,050 mL cylinder al 221 atm?

Rasek [7]

Answer:

T = 246 K

Explanation:

Given that,

Number of moles, n = 0.750 mol

The volume of the cylinder, V = 6850 mL = 6.85 L

Pressure of the gas, P = 2.21 atm

We need to find the temperature of the gas stored in the cylinder. We know that,

PV= nRT

Where

R is gas constant

T is temperature

So,

$T=\dfrac{PV}{nR}\\\\T=\dfrac{2.21\times 6.85}{0.75\times 0.0821}\\T=245.85\ K$

T = 246 K

So, the temperature of the gas is equal to 246 K.

4 0

2 years ago

How many cm3 are there in 0.25 dm3?

aniked [119]

250cm3 i think im not sure about it though

8 0

3 years ago